/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Firefox Home.
 *
 * The Initial Developer of the Original Code is the Mozilla Foundation.
 *
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 *  Stefan Arentz <stefan@arentz.ca>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
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 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#import "NSData+SHA.h"

#import "WeaveKeys.h"

@implementation WeaveKeys

@synthesize cryptoKey = _cryptoKey;
@synthesize hmacKey = _hmacKey;

- (id) initWithMasterKey: (NSData*) key username: (NSString*) username
{
	if ((self = [super init]) != nil)
	{
		NSString* info = [@"Sync-AES_256_CBC-HMAC256" stringByAppendingString: username];
	
		NSData* data = [key HDKFSHA256ExpandWithInfo: [info dataUsingEncoding: NSASCIIStringEncoding] length: 32 * 2];
		_cryptoKey = [[data subdataWithRange: NSMakeRange(0, 32)] retain];
		_hmacKey = [[data subdataWithRange: NSMakeRange(32, 32)] retain];
	}

	return self;
}

- (void) dealloc
{
	[_cryptoKey release];
	[_hmacKey release];
	[super dealloc];
}

@end
